Chemical regeneration of granular activated carbon: preliminary evaluation of alternative regenerant solutions

Larasati, Amanda; Fowler, G.D.; Graham, Nigel

doi:10.1039/d0ew00328j

Cited by 53 publications

(35 citation statements)

References 66 publications

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“…In general, these values are comparable to or higher than those of other macrocycle‐crosslinked polymers to nonpolar or charged organic micropollutants, [4] and are significantly higher than those of other conventional adsorbents. For example, the adsorption rate constant of P2 to nitrobenzene is two orders of magnitude higher than that of the granular activated carbons [21] and three or more orders of magnitude higher than that of magnetic diatomite [22] . The superior adsorption kinetics of P2 over other adsorbents was also observed for 4‐nitrophenol, [23] benzocaine, [24] isoproturon, [21] and benzidine [25] …”

Section: Resultsmentioning

confidence: 99%

Effective and Rapid Removal of Polar Organic Micropollutants from Water by Amide Naphthotube‐Crosslinked Polymers

Yang

Yao

et al. 2021

Angew Chem Int Ed

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It is challenging to remove polar organic micropollutants from water through adsorption‐mediated processes. Macrocycle‐crosslinked polymers were recently shown to be effective adsorbents for nonpolar or charged organic micropollutants through specific host–guest binding, but are rarely used for the treatment of neutral and polar organic micropollutants. This is due to the challenge of recognizing polar molecules in water by macrocyclic hosts. In this research, we report two amide naphthotube‐crosslinked polymers which can effectively and rapidly adsorb a wide scope of polar organic micropollutants from water through biomimetic molecular recognition. Amide naphthotubes possess hydrogen bonding sites in their deep hydrophobic cavities and can effectively bind polar organic micropollutants in water through the hydrophobic effects and shielded hydrogen bonds. The cross‐linked polymers containing amide naphthotubes are even able to remove a complex mixture of organic micropollutants from water and the used materials can be easily regenerated through washing with MeOH or EtOH. This research provides a solution for the treatment of polar organic micropollutants by using biomimetic molecular recognition in water.

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Section: Resultsmentioning

confidence: 99%

Effective and Rapid Removal of Polar Organic Micropollutants from Water by Amide Naphthotube‐Crosslinked Polymers

Yang

Yao

et al. 2021

Angew Chem Int Ed

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“…[20] In general, these values are comparable to or higher than those of other macrocycle-crosslinked polymers to nonpolar or charged organic micropollutants, [4] and are significantly higher than those of other conventional adsorbents.For example,the adsorption rate constant of P2 to nitrobenzene is two orders of magnitude higher than that of the granular activated carbons [21] and three or more orders of magnitude higher than that of magnetic diatomite. [22] Thes uperior adsorption kinetics of P2 over other adsorbents was also observed for 4-nitrophenol, [23] benzocaine, [24] isoproturon, [21] and benzidine. [25] Simultaneous Removal of Multiple Micropollutants from Water Thecross-linked polymer P2 was further challenged with ac omplex mixture containing all the 18 organic micropollutants.T he experiment was performed by gradually adding P2 to the solution containing the mixture (D 2 O, 0.5 mL, the concentration is 1.0 mM for every micropollutant).…”

Section: Adsorption Removal Of Other Organic Micropollutants From Watermentioning

confidence: 96%

Effective and Rapid Removal of Polar Organic Micropollutants from Water by Amide Naphthotube‐Crosslinked Polymers

Yang

Yao

et al. 2021

Angewandte Chemie

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It is challenging to remove polar organic micropollutants from water through adsorption-mediated processes. Macrocycle-crosslinked polymers were recently shown to be effective adsorbents for nonpolar or charged organic micropollutants through specific host-guest binding,b ut are rarely used for the treatment of neutral and polar organic micropollutants.T his is due to the challenge of recognizing polar molecules in water by macrocyclic hosts.I nt his research, we report two amide naphthotube-crosslinked polymers which can effectively and rapidly adsorb aw ide scope of polar organic micropollutants from water through biomimetic molecular recognition. Amide naphthotubes possess hydrogen bonding sites in their deep hydrophobic cavities and can effectively bind polar organic micropollutants in water through the hydrophobic effects and shielded hydrogen bonds.T he cross-linked polymers containing amide naphthotubes are even able to remove ac omplex mixture of organic micropollutants from water and the used materials can be easily regenerated through washing with MeOH or EtOH. This research provides asolution for the treatment of polar organic micropollutants by using biomimetic molecular recognition in water.

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“…Regeneration and reuse of the adsorbent during many cycles of the treatment, both the disposal difficulty of the adsorbent and the replacement of the new one are an important economic indicator and essential aspect of the feasibility of the adsorption process (Lata et al 2015;Dhoble et al 2017). Among the various regeneration methods with different advantages and disadvantages, chemical regeneration stands out due to its high efficiency and speed of regeneration and low energy requirement (Ghasemzadeh et al 2017;Larasati et al 2020). Environmental condition-occurred adsorption is of great importance in determining the solution to be used in chemical regeneration (Larasati et al 2020).…”

Section: Regeneration Studymentioning

confidence: 99%

“…Among the various regeneration methods with different advantages and disadvantages, chemical regeneration stands out due to its high efficiency and speed of regeneration and low energy requirement (Ghasemzadeh et al 2017;Larasati et al 2020). Environmental condition-occurred adsorption is of great importance in determining the solution to be used in chemical regeneration (Larasati et al 2020). In the regeneration of GOFeZA, the solution of 0.1 M NaOH was passed through the exhausted fixed-bed column at the flow rate of 1.7 mL/min in downflow mode.…”

Section: Regeneration Studymentioning

confidence: 99%

Removal of arsenate using graphene oxide-iron modified clinoptilolite-based composites: adsorption kinetic and column study

Baskan

Hadimlioglu²

2021

J Anal Sci Technol

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In this study, graphene oxide (GO), iron modified clinoptilolite (FeZ), and composites of GO-FeZ (GOFeZA and GOFeZB) were synthesized and characterized using SEM, EDS, XRF, FTIR, and pHpzc. The arsenate uptake on composites of GOFeZA and GOFeZB was examined by both kinetic and column studies. The adsorption capacity increases with the increase of the initial arsenate concentration at equilibrium for both composites. At the initial arsenate concentration of 450 μg/L, the arsenate adsorption on GOFeZA and GOFeZB was 557.86 and 554.64 μg/g, respectively. Arsenate adsorption on both composites showed good compatibility with the pseudo second order kinetic model. The adsorption process was explained by the surface complexation or ion exchange and electrostatic attraction between GOFeZA or GOFeZB and arsenate ions in the aqueous solution due to the relatively low equilibrium time and fairly rapid adsorption of arsenate at the beginning of the process. The adsorption mechanism was confirmed by characterization studies performed after arsenate was loaded onto the composites. The fixed-bed column experiments showed that the increasing the flow rate of the arsenate solution through the column resulted in a decrease in empty bed contact time, breakthrough time, and volume of treated water. As a result of the continuous operation column study with regenerated GOFeZA, it was demonstrated that the regenerated GOFeZA has lower breakthrough time and volume of treated water compared to fresh GOFeZA.

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Chemical regeneration of granular activated carbon: preliminary evaluation of alternative regenerant solutions

Abstract: An adsorption and desorption study has been conducted using five organic compounds of different physico-chemical properties and four regenerant solutions to evaluate the feasibility of a novel on-site chemical regeneration of GAC.

Cited by 53 publications

References 66 publications

Effective and Rapid Removal of Polar Organic Micropollutants from Water by Amide Naphthotube‐Crosslinked Polymers

Effective and Rapid Removal of Polar Organic Micropollutants from Water by Amide Naphthotube‐Crosslinked Polymers

Effective and Rapid Removal of Polar Organic Micropollutants from Water by Amide Naphthotube‐Crosslinked Polymers

Removal of arsenate using graphene oxide-iron modified clinoptilolite-based composites: adsorption kinetic and column study

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